package com.wtwd.device.util;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.util.EntityUtils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.*;
import java.util.List;
import java.util.Map;
import java.util.zip.GZIPInputStream;

public class HttpClients {
    private static final String CHARSET_UTF8 = "UTF-8";
    private static final String CHARSET_GBK = "GBK";
	 /**
     * 向指定URL发送GET方法的请求
     * 
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("Content-Type","application/json;charset=UTF-8");
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            GZIPInputStream gZipS=new GZIPInputStream(connection.getInputStream());
            InputStreamReader res = new InputStreamReader(gZipS,"UTF-8");
            in = new BufferedReader(res);
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     * 
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        
        return result;
    }

    /**
     * @param
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public static String getForObject(String url) {
        HttpClient httpClient = org.apache.http.impl.client.HttpClients.createDefault();
        HttpGet httpGet = new HttpGet();
        URL url1 = null;
        URI uri = null;
        try {
            url1 = new URL(url);
            //将url中非法字符串转码
            uri = new URI(url1.getProtocol(), url1.getHost(), url1.getPath(), url1.getQuery(), null);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
        httpGet.setURI(uri);
        String response = null;
        try {
            response = (String) httpClient.execute(httpGet, responseHandler);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            abortConnection(httpGet, httpClient);
        }
        return response;
    }
    // 使用ResponseHandler接口处理响应，HttpClient使用ResponseHandler会自动管理连接的释放，解决了对连接的释放管理
    private static ResponseHandler responseHandler = new ResponseHandler() {
        // 自定义响应处理
        public String handleResponse(HttpResponse response) throws ClientProtocolException, IOException {
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                String charset = EntityUtils.getContentCharSet(entity) == null ? CHARSET_GBK : EntityUtils.getContentCharSet(entity);
                return new String(EntityUtils.toByteArray(entity), charset);
            } else {
                return null;
            }
        }
    };

    /**
     * 释放HttpClient连接
     *
     * @param hrb        请求对象
     * @param httpclient client对象
     */
    private static void abortConnection(final HttpRequestBase hrb, final HttpClient httpclient) {
        if (hrb != null) {
            hrb.abort();
        }
        if (httpclient != null) {
            httpclient.getConnectionManager().shutdown();
        }
    }
}
